<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>DIV CSS遮罩层</title>
    <script language="javascript" type="text/javascript">
        function showdiv() {
            document.getElementById("bg").style.display = "block";
            document.getElementById("show").style.display = "block";
        }
    </script>

    <style type="text/css">
        #bg {
            display: none;
            position: absolute;
            top: 0%;
            left: 0%;
            width: 100%;
            height: 100%;
            background-color: black;
            z-index: 1001;
            -moz-opacity: 0.7;
            opacity: .70;
            filter: alpha(opacity=70);
        }

        #show {
            display: none;
            position: absolute;
            top: 25%;
            left: 22%;
            width: 53%;
            height: 49%;
            z-index: 1002;
            overflow: auto;
        }

        .justify {
            width: 100%;
            height: 100%;
            display: -webkit-box;
            display: -ms-flexbox;
            display: -webkit-flex;
            display: flex;
            -webkit-box-pack: center;
            -ms-flex-pack: center;
            -webkit-justify-content: center;
            justify-content: center;
            -webkit-box-align: center;
            -ms-flex-align: center;
            -webkit-align-items: center;
            align-items: center
        }

        .spinner {
            margin: 0px auto;
            width: 50px;
            height: 60px;
            text-align: center;
            font-size: 10px;
        }

        .spinner > div {
            background-color: #67CF22;
            height: 100%;
            width: 6px;
            display: inline-block;

            -webkit-animation: stretchdelay 1.2s infinite ease-in-out;
            animation: stretchdelay 1.2s infinite ease-in-out;
        }

        .spinner .rect2 {
            -webkit-animation-delay: -1.1s;
            animation-delay: -1.1s;
        }

        .spinner .rect3 {
            -webkit-animation-delay: -1.0s;
            animation-delay: -1.0s;
        }

        .spinner .rect4 {
            -webkit-animation-delay: -0.9s;
            animation-delay: -0.9s;
        }

        .spinner .rect5 {
            -webkit-animation-delay: -0.8s;
            animation-delay: -0.8s;
        }

        @-webkit-keyframes stretchdelay {
            0%, 40%, 100% {
                -webkit-transform: scaleY(0.4)
            }
            20% {
                -webkit-transform: scaleY(1.0)
            }
        }

        @keyframes stretchdelay {
            0%, 40%, 100% {
                transform: scaleY(0.4);
                -webkit-transform: scaleY(0.4);
            }
            20% {
                transform: scaleY(1.0);
                -webkit-transform: scaleY(1.0);
            }
        }

    </style>
</head>
<body>
<input id="btnshow" type="button" value="Show" onclick="showdiv();"/>

<div id="bg"></div>
<div id="show">
    <div class="justify">
        <div class="spinner">
            <div class="rect1"></div>
            <div class="rect2"></div>
            <div class="rect3"></div>
            <div class="rect4"></div>
            <div class="rect5"></div>
        </div>
    </div>
</div>


</body>
</html>